code940 now plays mp3s

[picodrive.git] / platform / gp2x / code940 / 940.c

diff --git a/platform/gp2x/code940/940.c b/platform/gp2x/code940/940.c
new file mode 100644 (file)
index 0000000..e0c4002
--- /dev/null
+++ b/platform/gp2x/code940/940.c
@@ -0,0 +1,134 @@
+#include "940shared.h"\r
+\r
+static _940_data_t *shared_data = (_940_data_t *)   0x00100000;\r
+static _940_ctl_t  *shared_ctl  = (_940_ctl_t *)    0x00200000;\r
+static unsigned char *mp3_data  = (unsigned char *) 0x01000000;\r
+YM2612 *ym2612_940;\r
+int *mix_buffer;\r
+\r
+// from init.s\r
+void wait_irq(void);\r
+void spend_cycles(int c);\r
+void cache_clean(void);\r
+void cache_clean_flush(void);\r
+\r
+//     asm volatile ("mov r0, #0" ::: "r0");\r
+//     asm volatile ("mcr p15, 0, r0, c7, c6,  0" ::: "r0"); /* flush dcache */\r
+//     asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */\r
+\r
+void Main940(int startvector)\r
+{\r
+       ym2612_940 = &shared_data->ym2612;\r
+       mix_buffer = shared_data->mix_buffer;\r
+\r
+       // debug\r
+       shared_ctl->vstarts[startvector]++;\r
+       // asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");\r
+\r
+\r
+       for (;;)\r
+       {\r
+               int job_num = 0;\r
+/*\r
+               while (!shared_ctl->busy)\r
+               {\r
+                       //shared_ctl->waitc++;\r
+                       spend_cycles(8*1024);\r
+               }\r
+*/\r
+               if (!shared_ctl->busy)\r
+               {\r
+                       wait_irq();\r
+               }\r
+\r
+               for (job_num = 0; job_num < MAX_940JOBS; job_num++)\r
+               {\r
+                       switch (shared_ctl->jobs[job_num])\r
+                       {\r
+                               case JOB940_INITALL:\r
+                                       /* ym2612 */\r
+                                       shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;\r
+                                       YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);\r
+                                       /* Helix mp3 decoder */\r
+                                       shared_data->mp3dec = MP3InitDecoder();\r
+                                       break;\r
+\r
+                               case JOB940_YM2612RESETCHIP:\r
+                                       YM2612ResetChip_();\r
+                                       break;\r
+\r
+                               case JOB940_PICOSTATELOAD:\r
+                                       YM2612PicoStateLoad_();\r
+                                       break;\r
+\r
+                               case JOB940_YM2612UPDATEONE: {\r
+                                       int i, dw, *wbuff;\r
+                                       if (shared_ctl->writebuffsel == 1) {\r
+                                               wbuff = (int *) shared_ctl->writebuff1;\r
+                                       } else {\r
+                                               wbuff = (int *) shared_ctl->writebuff0;\r
+                                       }\r
+\r
+                                       /* playback all writes */\r
+                                       for (i = 2048/2; i > 0; i--) {\r
+                                               UINT16 d;\r
+                                               dw = *wbuff++;\r
+                                               d = dw;\r
+                                               if (d == 0xffff) break;\r
+                                               YM2612Write_(d >> 8, d);\r
+                                               d = (dw>>16);\r
+                                               if (d == 0xffff) break;\r
+                                               YM2612Write_(d >> 8, d);\r
+                                       }\r
+\r
+                                       YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);\r
+                                       break;\r
+                               }\r
+\r
+                               case JOB940_MP3DECODE: {\r
+                                       int mp3_offs = shared_ctl->mp3_offs;\r
+                                       unsigned char *readPtr = mp3_data + mp3_offs;\r
+                                       int bytesLeft = shared_ctl->mp3_len - mp3_offs;\r
+                                       int offset; // frame offset from readPtr\r
+                                       int err;\r
+\r
+                                       if (bytesLeft <= 0) break; // EOF, nothing to do\r
+\r
+                                       offset = MP3FindSyncWord(readPtr, bytesLeft);\r
+                                       if (offset < 0) {\r
+                                               shared_ctl->mp3_offs = shared_ctl->mp3_len;\r
+                                               break; // EOF\r
+                                       }\r
+                                       readPtr += offset;\r
+                                       bytesLeft -= offset;\r
+\r
+                                       err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,\r
+                                               shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);\r
+                                       if (err) {\r
+                                               if (err == ERR_MP3_INDATA_UNDERFLOW) {\r
+                                                       shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF\r
+                                                       break;\r
+                                               } else if (err <= -6 && err >= -12) {\r
+                                                       // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*\r
+                                                       // just try to skip the offending frame..\r
+                                                       readPtr++;\r
+                                               }\r
+                                               shared_ctl->mp3_errors++;\r
+                                               shared_ctl->mp3_lasterr = err;\r
+                                       }\r
+                                       shared_ctl->mp3_offs = readPtr - mp3_data;\r
+                                       break;\r
+                               }\r
+                       }\r
+               }\r
+\r
+               cache_clean();\r
+//             asm volatile ("mov r0, #0" ::: "r0");\r
+//             asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */\r
+//             cache_clean_flush();\r
+\r
+               shared_ctl->loopc++;\r
+               shared_ctl->busy = 0;\r
+       }\r
+}\r
+\r